Urban, social, cultural analysis of fusion cities, two bordering cities growing together, with different types of borders: natural, artificial, political, and social. The work is displayed in maps and visual language. BRAKIN_natural : Brazzaville and Kinshasa by Humerto Sarabio and Marion Bouchard SAN JUANA_artificial : San Diego and Tijuana by Julio Obregon Zepeda and Anne Touchet JERUSALEM_political : East and West Jerusalem by Slobodan Subotić and Petko Gogov FAVEMINIO_social : Favela and Condominio in Rio de Janeiro by Eleni Sougaris